fix: Use full file paths in dataflow report

[spdawson]

Description

All filenames in the output should consistently use the full path, including the scan target directory prefix.

Sample output before

data_types:
    - name: Email Address
      detectors:
        - name: rails
          locations:
            - filename: ../scan_target_rails/db/schema.rb
              line_number: 18
        - name: ruby
          locations:
            - filename: ../scan_target_rails/config/initializers/devise.rb
              line_number: 186
components:
    - name: Disk
      locations:
        - detector: rails
          filename: config/storage.yml
          line_number: 5
    - name: PostgreSQL
      locations:
        - detector: rails
          filename: config/database.yml
          line_number: 85
    - name: Redis
      locations:
        - detector: gemfile-lock
          filename: Gemfile.lock
          line_number: 191

Sample output after

data_types:
    - name: Email Address
      detectors:
        - name: rails
          locations:
            - filename: ../scan_target_rails/db/schema.rb
              line_number: 18
        - name: ruby
          locations:
            - filename: ../scan_target_rails/config/initializers/devise.rb
              line_number: 186
components:
    - name: Disk
      locations:
        - detector: rails
          filename: ../scan_target_rails/config/storage.yml
          line_number: 5
    - name: PostgreSQL
      locations:
        - detector: rails
          filename: ../scan_target_rails/config/database.yml
          line_number: 85
    - name: Redis
      locations:
        - detector: gemfile-lock
          filename: ../scan_target_rails/Gemfile.lock
          line_number: 191

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format

[swarmia]

✅  Linked to AMA-3278 · Include project path in filenames, in dataflow report
➡️  Part of AMA-3080 · Backport framework classification from ruby app
➡️  Part of AMA-2947 · OSS - Curio CLI

[cfabianski]

what do you think @elsapet?

[elsapet]

🎉